McALLEN, Texas (AP) - Two days after President Donald Trump ordered an end to the separation of families at the border, federal authorities Friday were still working on a plan to reunite an estimated 1,800 children with their parents and keep immigrant households together.

Immigration and Customs Enforcement posted a notice saying it is looking into creating 15,000 beds for use in detaining immigrant families. A day earlier, the Pentagon said it was drawing up plans to house as many as 20,000 migrants on U.S. military bases.

Beyond that, however, there was nothing but frustration and worry for many of the parents separated from their children and placed in detention centers for illegally entering the country over the past several weeks.

Some parents struggled to get in touch with youngsters being held in many cases hundreds of miles away, in places like New York and the Chicago area. Some said they didn't even know where their children were.

Trump himself took a hard line on the crisis, accusing the Democrats of telling "phony stories of sadness and grief."

"We cannot allow our country to be overrun by illegal immigrants," the president tweeted.

We must maintain a Strong Southern Border. We cannot allow our Country to be overrun by illegal immigrants as the Democrats tell their phony stories of sadness and grief, hoping it will help them in the elections. Obama and others had the same pictures, and did nothing about it!

More than 2,300 children were taken from their families at the border in recent weeks. A senior Trump administration official said that about 500 of them have been reunited since May.

Trump's decision to stop separating families, announced Wednesday after a fierce international outcry, has led to confusion and uncertainty along the border.

We are gathered today to hear directly from the AMERICAN VICTIMS of ILLEGAL IMMIGRATION. These are the American Citizens permanently separated from their loved ones b/c they were killed by criminal illegal aliens. These are the families the media ignores...https://t.co/ZjXESYAcjY

Federal agencies are working to set up a centralized reunification process for all remaining children at a detention center in Texas, said the senior administration official, who was not authorized to discuss the matter publicly and spoke to The Associated Press on condition of anonymity.

In the meantime, federal authorities appear to be easing up on the Trump administration's "zero tolerance" policy of prosecuting all adults caught illegally entering the U.S. - though the Justice Department flatly denied there has been any change.

The federal public defender's office for the region that covers El Paso to San Antonio said in an email made public Thursday that prosecutors will no longer charge parents with illegally entering the U.S. if they have children with them.

Outside the federal courthouse in McAllen, immigration attorney Efren Olivares said 67 people were charged Friday morning with illegal entry, but none were parents with children. He said it was the first time since May 24 that that happened in McAllen.

"It appears that this is a consequence of a change in policy by the government," he said.

ICE has only three facilities nationwide - two in Texas, one in Pennsylvania - that can be used to detain immigrant families, and they have a combined 3,300 beds.

The one in Dilley, Texas, opened in 2015 on a remote site that was once an encampment for oil workers. It contains collections of cottages built around playgrounds and common areas, but also has high security.

Finding space is not the only hurdle: Under a 1997 court settlement that the Trump administration is trying to overturn, children can be held with their parents in detention centers for no more than 20 days.

Zenen Jaimes Perez of the Texas Civil Rights Project said immigrant families are still awaiting details from the administration on how parents and children are to be reunited.

"It could take a couple of months, a couple of days ... but we don't have timelines," James Perez said. "What we need to hear is what the administration says this process is going to look like, because we don't know."

The group has been interviewing migrants each morning at the McAllen courthouse and entering information into a database to help keep track of parents and children held in different facilities, sometimes scattered around the country.

Olivares said it is difficult for government agencies to reunite immigrant families once they are separated because the systems that process adults and those that handle youngsters often don't communicate with each other.

Adults accused of immigration offenses are under the authority of the Homeland Security Department, while youngsters taken from their parents are overseen by Health and Human Services.

Meanwhile, a 7-year-old boy and his mother, separated a month ago, were reunited Friday after she sued in federal court and the Justice Department agreed to release the child.

They were brought back together around 2:30 a.m. at Baltimore-Washington International Airport in Maryland, hours after the government relented.

The mother, Beata Mariana de Jesus Mejia-Mejia, had filed for political asylum after crossing the border with her son, Darwin, following a trek from Guatemala. She said that she cried when the two were reunited and that she is never going to be away from him again.

But a 31-year-old Brazilian man held in Cibola County Correctional Center in Milan, New Mexico, said he didn't know when he would see his 9-year-old son again.

The father told the AP in a phone interview that he spoke to his son once by phone since they were separated 26 days earlier. The man, who is seeking asylum, spoke on condition of anonymity because, he said, a gang is looking for him in Brazil for failure to pay an $8,000 debt.

The man said he worries about his son, who speaks only Portuguese.

"He cried. He was so sad," the father said. "I had promised him it would only be three to five days."

On Capitol Hill, in yet another abrupt reversal by the president, Trump on Friday told fellow Republicans in Congress to "stop wasting their time" on immigration legislation until after the November elections.

Stubborn differences between conservative and more moderate Republicans have stalled legislation on Capitol Hill.___Long reported from Washington, Taxin from Santa Ana, California. Associated Press writers Pauline Arrillaga in Phoenix and Nomaan Merchant in McAllen, Texas; contributed to this report.

(Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

The largest U.S. seller of San Marzano tomatoes, known to food lovers as the best tomatoes to make pasta sauce, has been hit with two federal lawsuits claiming what's inside the can isn't the real thing.

The largest U.S. seller of San Marzano tomatoes, known to food lovers as the best tomatoes to make pasta sauce, has been hit with two federal lawsuits claiming what's inside the can isn't the real thing.